Dtc81 - Clutch Switch System Fault; Second But Not More Than 3 Seconds. (Press The Accelerator Pedal.) 2. Turn On The Idle Position Switch For Not Less Than; Second But Not More Than 3 Seconds. (Release The Accelerator Pedal.) 3. Turn Off The Idle Position Switch For Not Less Than; Second But Not More Than 3 Seconds. (Release The Accelerator Pedal.) - Isuzu 4HL1 Workshop Manual

DTC81 - Clutch Switch System Fault

Freezer
SW
0.85 L/B
0.5
L/B
47
Circuit Description
The clutch switch is installed to the clutch pedal, and is
turned on when the pedal is pressed and turned off
when the pedal is released. The ECM receives the on/
off signal from this clutch switch and uses it in exhaust
brake control and other control tasks.
DTC81 will be set when the clutch switch on/off signal
is faulty.
Major Faulty Event
• Inactive exhaust brake
• Inactive QWS
• Inactive PTO
Conditions for Setting the DTC
On the manual transmission vehicle, the engine is
running for at least 180 seconds, the vehicle speed is
at least 80 km/h, and the clutch switch is changed from
off to on or on to off.
M/T : N Warm
A/T : P Up
or N SW
0.5 0.5 0.5
B/G BR/R LG/R
44 12 50
SBF
100A
Battery
Main Relay
Torque
Exhaust
Cut
Brake
SW
SW
CFS
Non
Vehicle
0.5 0.5
W/O W/L
11 49
Action Taken When the DTC Sets
• After the DTC is set, the ECM will illuminate the
CHECK ENGINE lamp (MIL).
• The exhaust brake is disabled.
Conditions for Clearing MIL/DTC
When the system fails and the DTC is stored to the
ECM, even repairing the faulty portion will not clear the
DTC from the memory. To clear the DTC, conduct the
following steps.
1. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
2. Turn on the idle position switch for not less than 1
second but not more than 3 seconds. (Release the
accelerator pedal.)
3. Turn off the idle position switch for not less than 1
second but not more than 3 seconds. (Press the
accelerator pedal.)
Engine Control System 1A-159
SBF
50A
Key
SW
(ON)
# 19
15A
Clutch
SW
CFS
CFS
Vehicle
0.85 0.5
0.5 LG/L
B/O B/W
36
Key SW
(START)
# 22
10A
46
VIM
(Vehicle
Interface
Module)
LNW21ALF005701-X